Fatigue Evaluation of a Railway Steel Bridge Based on In-site Test Data

2007 ◽  
Author(s):  
Chunsheng Wang ◽  
Hui Qian ◽  
Ang Zhan ◽  
Xin Yu
Keyword(s):  
Test Data ◽  
Steel Bridge ◽  
Fatigue Evaluation ◽  
Site Test

Low-Cycle Fatigue Evaluation Using the Weld Master S-N Curve

2006 ◽  
Author(s):  
P. Dong ◽  
Z. Cao ◽  
J. K. Hong
Keyword(s):  
Test Data ◽  
Low Cycle Fatigue ◽  
Strain Curve ◽  
Cyclic Stress ◽  
Structural Stress ◽  
Stress Strain ◽  
Strain Behavior ◽  
Scale Test ◽  
Stress Estimation ◽  
Fatigue Evaluation

In the context of fatigue evaluation in the low-cycle regime, the use of the master S-N curve in conjunction with elastic FE-based structural stress calculations is presented. An elastic pseudo structural stress estimation is introduced by assuming that Neuber’s rule applies in relating structural stress and strain concentration at a weld to the material’s cyclic stress-strain behavior. With the pseudo structural stress procedure, recent sources of recent full scale test data on pipe and vessel welds were analyzed as a validation of the proposed procedure. The estimated fatigue lives versus actual test lives show a reasonable agreement. Finally, the feasibility of using monotonic stress-strain curves as a first approximation is also examined for applications when cyclic stress-strain curve may not be readily found. The analysis results indicate that the life estimations using monotonic stress-strain curves are reasonable, with the recent test data falling within mean ± 2σ, where σ represents the standard deviation of the master S-N curve.

Analysis of Recent Fatigue Data Using the Structural Stress Procedure in ASME Div 2 Rewrite

2006 ◽  
Vol 129 (3) ◽  
pp. 355-362 ◽  
Author(s):  
Pingsha Dong ◽  
Jeong K. Hong ◽  
Abílio M. P. De Jesus
Keyword(s):  
Test Data ◽  
Hot Spot ◽  
Comparative Assessment ◽  
Structural Stress ◽  
Hot Spot Stress ◽  
Classification Approach ◽  
Fatigue And Fracture ◽  
Fatigue Data ◽  
Fatigue Evaluation ◽  
Assessment Procedures

In support of the ASME Div 2 Rewrite, a master S-N curve approach has been developed using a mesh-insensitive structural stress procedure for fatigue evaluation of welded components. The effectiveness of the master S-N curve approach has been demonstrated in a number of earlier publications for many joint types and loading conditions for pipe and vessel components as well as plate joints. To further validate the structural stress method, a series of recent test data (small weld details and a full-scale vessel) published by De Jesus et al. (2004, Fatigue and Fracture of Engineering Materials and Structures, 27, pp. 799–810) were analyzed in this paper. A comparative assessment of various existing procedures and their effectiveness in correlating the fatigue test data by De Jesus is also presented. These assessment procedures include current ASME Sec. VIII Div 2, weld classification approach in PD 5500, and the surface extrapolation-based hot spot stress approach in recently approved European EN 13445 Standards.

Testing Study and Numerical Analysis of Dynamic Compaction on the Red Sandstone Rubble Soil

2011 ◽  
Vol 97-98 ◽  
pp. 151-155
Author(s):  
Xi Long Kuang
Keyword(s):  
Numerical Analysis ◽  
Test Data ◽  
Dynamic Compaction ◽  
Site Testing ◽  
Red Sandstone ◽  
Testing Data ◽  
Site Test ◽  
Effective Reinforcement ◽  
The Impact ◽  
The Relationship

The drop distance, times of dynamic compaction and other parameters are studied by on-site testing in order to analyse quantitatively the impact on effective reinforcement depth and radius of the red sandstone rubble soil. Large amounts of on-site test data shows that compactness standard is 93%, strong encryption range is 1.0～4.0m, the effective impact depth is 4～6m and the effective impact radius is 2.5～3.5m. At the same time, through comparison and verification the on-site testing data and numerical analysis, the relationship between times of dynamic compacting and sandstones subside is . Further more, it is revealed that dynamic compaction can restrain effectively the deformation of high fill embankment of the red sandstone rubble soil.

An Analytical-Based Structural Strain Method for Low Cycle Fatigue Evaluation of Girth-Welded Pipes

2017 ◽  
Author(s):  
Xianjun Pei ◽  
Wei Wang ◽  
Pingsha Dong
Keyword(s):  
Test Data ◽  
Low Cycle Fatigue ◽  
Deformation Condition ◽  
Structural Stress ◽  
Pipe Section ◽  
Fatigue Evaluation ◽  
Welded Pipe ◽  
Structural Strain ◽  
Outer Fiber ◽  
Strain Method

As a further extension to the structural stress based master S-N curve method adopted by ASME Div 2 since 2007, this paper presents an analytical-based structural strain method for girth-welded piping components. Here, structural strain is defined as outer and inner fiber strains calculated corresponding to a deformation condition in which a pipe section plane before deformation remains as a plane after deformation. The analytical formation takes into account all possible plastic deformation conditions a pipe section subjected to a combined remote cyclic bending and axial tension. A simple numerical procedure is used for solving both outer fiber and inner fiber strains, as well as the corresponding elastic core size. For fatigue evaluation purpose, the outer fiber strain can be used to calculate the corresponding pseudo elastic structural stress range so that the structural stress based master S-N curve can be directly used. Under linear elastic deformation conditions, the structural strain definition becomes exactly the same as that calculated by the structural stress method which is the basis on the ASME Div 2 master S-N was developed. A set of a recent full scale girth-welded pipe component test data in low-cycle regime was analyzed using the structural strain method. The results showed that all these new test data fall well within the ASME Div 2 master S-N curve scatter band defined by mean+-standard deviations. In addition to its demonstrated effectiveness, the key advantage of this structural strain method is its simplicity for dealing with girth-welded pipe sections, since finite element stress analysis is no longer needed.

Investigation of Torsional Stress Intensification Factors and Stress Indices for Girth Butt Welds in Straight Pipe

2002 ◽  
Author(s):  
Edward A. Wais ◽  
E. C. Rodabaugh ◽  
R. Carter
Keyword(s):  
Carbon Steel ◽  
Test Data ◽  
Straight Pipe ◽  
Butt Weld ◽  
Bending Tests ◽  
Butt Welds ◽  
Stress Indices ◽  
Stress Intensification Factor ◽  
Torsional Test ◽  
Fatigue Evaluation

The basis for fatigue evaluation of ASME Section III Class 2, 3 and B31.1 piping is the girth butt weld where the Stress Intensification Factor (SIF) is defined to be 1.0. The SIFs for other components are based on comparison to the butt welds. This SIF of 1.0 for butt welds is based on extensive bending tests on carbon steel straight pipe which are reviewed and summarized in this study. The results of new test data, including torsional test data, are presented. The authors are unaware of any previous torsional tests on carbon steel straight pipe. This new data leads to suggested changes in the codes taking into account the directionality of the loading.

Influence of Asphalt Surfacing on Fatigue Evaluation of Rib-to-Deck Joints in Orthotropic Steel Bridge Decks

2014 ◽  
Vol 19 (10) ◽  
pp. 04014038 ◽  
Author(s):  
Ming Li ◽  
Kunitaro Hashimoto ◽  
Kunitomo Sugiura
Keyword(s):  
Bridge Decks ◽  
Steel Bridge ◽  
Fatigue Evaluation
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